Furnace-grate



(No Model.)

S. MANN. FURNAGB GRATB.

No. 551,505. Patented Deo. 17, 1895.

Qatar; c e y UNITED STATES PATENT EEicE.,

SAMUEL MANN, OF MILFORD, INDIANA.

FU RNACE-G RATE.

SPECIFICATION forming part of Letters Patent No. 551,505, dated December 17, 1895.

Application lexl September 18, 1895. Serial No. 562,866. (No model.)

To @ZZ whom t may concern:

Be it known that l, SAMUEL MANN, a citizen of the United States, residing at Milford, in the county of Kosciuslro and State of Indiana, have invented certain new and useful Improvements in Furnace-Grates5 and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in furnace-grates, and it is designed more particularly for use in such furnaces as use sawdust, tanbark, bagasse, and the like for fuel, and the novelty and many advantages of such construction will appear from the following description and claims,when taken in connection with the annexed drawings, in which- Figure 'l is a transverse horizontal sectional view of a furnace, illustrating my improved grate therein. Fig. 2 is a vertical cross-sectional view of the same, showing the grate and the blast apparatus in elevation. Fig. 3 is a side elevation of one of the gratebars with the blast-pipe attached, and Fig. llis an enlarged sectional view taken in the plane indicated by the dotted line rc m on Fig. 3.

Referring by letter to said drawings, A indicates the side walls and B the bridge-wall of a furnace, which may be of any ordinary or approved construction.

C indicates grate-bars which are of a concavo-convex form in cross-section. These bars are perforated, as shown at a, and are arranged in the furnace with their convex side up. These bars C are of approximately flat contour an d have their longitudinal edges straight, or approximately so, as shown at b, for a purpose which will presently appear, and are also preferably provided on their under sides with longitudinallydisposed ribs or strengtheningflanges d.

Alternating' with each gratebar C is a grate bar D, which is hollow and designed to receive an air-blast from a pipe or conduit E.

These hollowbars are of a form substantially as shown, having vertical holes or apertures f in the flat portion or plate e and having a central longitudinal slot or opening c, which is closed by a cap F. This cap F, which closes the slot g, slopes or pitches laterally, as shown by the walls h, and the ends of said cap slope,

as shown at 'il At the base of these sloping walls and in the sides and ends of the cap are laterally-disposed holes or apertures j, which are designed to direct blasts over the Vperforated grate-bars C and into the fuel thereon, The caps F, by reason of their bed ing sloped or pitched laterally, as shown, tend to deiiect the sawdust or other fuel placed on the grate onto the bars C, and the lateral disposition of the apertures j in said cap prevents said apertures from being iilled up by sawdust and similar fuel and also enables them to discharge the blast of air laterally' into and on the fuel on the bars C, so as to materially promote the combustion of said fuel.

Depending from the slot g of the bars D is a blast-trough This blasttrough, as bettershown in Fig. 3 of the drawings, slopes from opposite ends to the point Z, where the blastpipe E connects therewith. This blasttrough is provided with a suitable aperture m, and a coupling Gis employed for connecting the blast-pipe E therewith. It will be observed that in coupling the end of the blast-pipe with the hollow bar an elbow n is employed in addition to the coupling Z7 employed at the other points of connection. By reason of the sloping formation of the blast-trough I am enabled to more effectively distribute and force the blast through the hollow bars and into the fuel. By alternating these blast-bars or hollow bars with the perforated iiat bars I get a very thorough combustion of the fuel, as the forced draft aided by the natural draft through the perforated bars serves very effectively in the consumption.

I t will be seen that should any one of the bars become impaired or injured it can be readily removed and replaced by another without removing the entire grate, as the bars simply bear upon each other, the hollow or blast bars, which are the heavier, resting upon the longitudinal edges of the conca-voconvex bars.

Having described my invention, what l` claim isWA Y l. A grate bar comprising a body having vertical holes or apertures, a central, longi; tudinal slot a cap covering said slot and sloping outwardly in opposite directions and IOO directions and provided with lateral apertures at its base and also having aoeutra-i, depending blast trough provided with an aperture for connection with a blast pipe, subsmntially is speeied.

In testimony whereof affix my signature in presence of tvvo Witnesses.

SAMUEL MANN "Witnesses:

LLOYD L. BURRIS, C, D. FOSTER. 

